CN107120798A - Air conditioner defrosting control method - Google Patents
Air conditioner defrosting control method Download PDFInfo
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- CN107120798A CN107120798A CN201710349196.9A CN201710349196A CN107120798A CN 107120798 A CN107120798 A CN 107120798A CN 201710349196 A CN201710349196 A CN 201710349196A CN 107120798 A CN107120798 A CN 107120798A
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Abstract
The invention belongs to air-conditioning technical field, and in particular to a kind of air conditioner defrosting control method.In order to more accurately judge the opportunity into defrosting, air conditioner defrosting control method of the invention comprises the following steps：Detect outdoor unit coil temperature；The difference of a coil temperature and dew-point temperature is obtained every preset time；Calculate the average value of the difference obtained；Obtain the relative humidity of outdoor unit position；Based on the relative humidity of outdoor unit position, according to coil temperature and the average value of the difference of dew-point temperature, judge whether to make air conditioner enter defrosting mode.Influence due to relative humidity to air conditioner frosting, after the Rule of judgment for adding relative humidity, the time window that defrosting judges can farthest be extended by the average value of the difference between outdoor unit coil temperature and dew-point temperature, so as to more reasonably judge whether outdoor unit is stably in frosting state, it is to avoid instantaneous frosting causes air conditioner to frequently enter the phenomenon that defrosting is operated.
Description
Technical field
The invention belongs to air-conditioning technical field, and in particular to a kind of air conditioner defrosting control method.
Background technology
Air conditioner is as a kind of equipment that can adjust indoor environment temperature, its operation principle：By refrigerant
Indoor environment temperature is set to reduce or raise between circulation line by the State Transferring of high voltage/low voltage/gaseous state/liquid, i.e.,
From the perspective of indoor set, air conditioner is in refrigeration or heating condition.It is empty in the case of air conditioner is in heating condition
Easily frosting on the coil pipe of outdoor unit (evaporator) is adjusted, the frosting of outdoor unit coil pipe can cause the hydraulic performance decline of refrigeration system, so that
The heating effect of air conditioner is influenceed, the comfortableness of indoor environment is reduced, Consumer's Experience is influenceed.Therefore, it is in and heats in air conditioner
, it is necessary to carry out timely and effective defrosting to the outdoor unit coil pipe of air conditioner in the case of operating mode.
To solve the problems, such as the frosting of air conditioner, typically defrosted in the prior art using freezing (four-way valve is commutated, it is inverse to follow
Ring) or bypass defrosting (individually drawing loop to air-conditioner outdoor unit from the high-pressure side of compressor) mode air-conditioner outdoor unit is entered
Row defrosting.Wherein, can significantly it be declined using the environment temperature in room during refrigeration Defrost mode, so that reduce air-conditioning heats effect
Really, the comfortableness of indoor environment is influenceed, that is, sacrifices Consumer's Experience.It may proceed to enter air-conditioning using refrigerant during bypass Defrost mode
Heated in indoor set, i.e. air conditioner can be made to remain within heating condition, therefore bypass Defrost mode is obtained in recent years
It is widely applied.On the basis of Defrost mode determination, in order to ensure that the heating efficiency of indoor environment is unaffected, it should use up
It can be avoided that false defrosting (meets defrosting condition, but due to the more low reason of the humidity ratio of air, unit now is actual not to be had
Frosting) or defrosting excessively (meet the condition for continuing to defrost, but due to the reason, unit now such as the temperature of air is higher
It is actual to have completed defrosting) number of times.In consideration of it, selecting suitable defrosting opportunity to seem most important.Current Defrost method
, such as can be by setting the intervals of several outdoor environment temperatures, in each interval setting one it is generally necessary to introduce environment temperature
The fixed temperature difference (environment temperature and the difference of outdoor unit coil temperature) judges whether to make air conditioner enter defrosting mode.But
It is that this mode has error in the opportunity judgement for entering defrosting, false defrosting or the excessive phenomenon that defrosts often occurs.
The patent application document of Application No. " 201410372226.4 " discloses a kind of air-conditioner defrosting method, this application
In, the opportunity that outdoor unit enters defrosting mode is that outdoor unit coil temperature is less than dew-point temperature.Entered using the condition judgment and removed
Often there is the phenomenon frequently defrosted in the opportunity of frost.As long as that is, outdoor unit coil temperature is less than dew-point temperature, that is, carrying out
Defrosting, so, it is likely that the temperature of outdoor unit coil pipe does not have started frosting or frosting degree very just below dew-point temperature
Small, air conditioner has been put into defrosting mode, so as to influence the usage experience of user.
Therefore, this area needs a kind of new defrosting control method to solve the above problems.
The content of the invention
It is in order to solve above mentioned problem of the prior art, i.e., of the invention in order to more accurately judge the opportunity into defrosting
Propose a kind of air conditioner defrosting control method.The defrosting control method comprises the following steps：Heating condition is in air conditioner
In the case of, detect outdoor unit coil temperature；An outdoor unit coil temperature and dew-point temperature are obtained every the first preset time
Between difference；Calculate the average value of the difference between the outdoor unit coil temperature obtained and dew-point temperature；Obtain outdoor unit institute
Relative humidity in position；Based on the relative humidity of the outdoor unit position, according to the outdoor unit coil temperature and dew
The average value of difference between point temperature, judges whether to make air conditioner enter defrosting mode.
In the preferred embodiment of above-mentioned air conditioner defrosting control method, " the phase based on the outdoor unit position
To humidity, according to the average value of the difference between the temperature and dew-point temperature of the outdoor unit coil pipe, judge whether to make air conditioner
Into defrosting mode " the step of specifically include：Judge whether the relative humidity of the outdoor unit position is more than default humidity
Threshold value, in the case of the relative humidity of the outdoor unit position is more than the default humidity threshold, judges the outdoor
Whether the average value of the difference between machine coil temperature and dew-point temperature is more than the first given threshold, and judge according to judged result
Whether defrosting mode is entered；Relative humidity at the outdoor unit air outlet is not more than the situation of the default humidity threshold
Under, judge whether the average value of the difference between the outdoor unit coil temperature and dew-point temperature is more than the second given threshold, and
Judged whether to enter defrosting mode according to judged result.
In the preferred embodiment of above-mentioned air conditioner defrosting control method, go out position in the outdoor unit relatively wet
In the case of degree is more than the default humidity threshold：If difference between the outdoor unit coil temperature and dew-point temperature is flat
Average is more than the first given threshold, judges whether the duration of the state is more than second preset time, if the state is held
The continuous time is more than second preset time, then the air conditioner is entered defrosting mode；If the duration of the state is not
More than second preset time, then do not enter defrosting mode.
In the preferred embodiment of above-mentioned air conditioner defrosting control method, in the relatively wet of the outdoor unit position
In the case of degree is not more than the default humidity threshold：
If the average value of the difference between the temperature and dew-point temperature of the outdoor unit coil pipe is more than the second given threshold,
Judge whether the duration of the state is more than the 3rd preset time,
If the duration of the state is more than the 3rd preset time, the air conditioner is set to enter defrosting mode；
If the duration of the state is not more than the 3rd preset time, do not enter defrosting mode.
In the preferred embodiment of above-mentioned air conditioner defrosting control method, the default humidity threshold is 60%-80%
Interior arbitrary value, first preset time is arbitrary value in 10-15 seconds, and second preset time is any in 1-2 minutes
Value, the 3rd preset time is the arbitrary value in 2-3 minutes.
In the preferred embodiment of above-mentioned air conditioner defrosting control method, the default humidity threshold is 70%, described
First preset time is 15 seconds；And/or first given threshold is 0 degree Celsius, second preset time is 1 point
Clock；And/or second given threshold is 1 degree Celsius, the 3rd preset time is 2 minutes.
In the preferred embodiment of above-mentioned air conditioner defrosting control method, the defrosting control method is also including judgement
Not no the step of exit defrosting mode, the step includes：After the air conditioner enters defrosting mode, relatively more described outdoor unit disk
Pipe temperature and the 3rd given threshold；According to comparative result, judge whether to exit defrosting mode.
In the preferred embodiment of above-mentioned air conditioner defrosting control method, " according to comparative result, judge whether to exit and remove
The step of white pattern ", further comprises：In the case of the outdoor unit coil temperature is more than three given threshold, judge
Whether the duration of the state is more than the 4th preset time, if the duration of the state is default more than the described 4th
Between, then the air conditioner is exited defrosting mode；If the duration of the state is not more than the 4th preset time, make
The air conditioner maintains the defrosting operating condition.
In the preferred embodiment of above-mentioned air conditioner defrosting control method, the 3rd given threshold is 6-10 degrees Celsius
In the range of arbitrary value；And/or the 4th preset time is the arbitrary value in the range of 30-60 seconds.
In the preferred embodiment of above-mentioned air conditioner defrosting control method, the defrosting mode is by turning on bypass branch
The bypass defrosting mode that the mode on road is defrosted to outdoor unit coil pipe；And/or " obtain the relative of outdoor unit position
The step of humidity ", specifically includes the relative humidity obtained at outdoor unit air outlet.
In the inventive solutions, based on the relative humidity at outdoor unit air outlet, according to the outdoor unit coil pipe
The average value of difference between temperature and dew-point temperature, judges whether to make air conditioner enter defrosting mode.With directly ratio than outdoor
Machine coil temperature passes through the average value of the difference between outdoor unit coil temperature and dew-point temperature compared with the mode of dew-point temperature
The time window that defrosting judges can be farthest extended, so as to more reasonably judge outdoor unit whether stably in knot
White state, it is to avoid instantaneous frosting causes air conditioner to frequently enter the phenomenon that defrosting is operated.On this basis, relative humidity pair is added
The influence of air conditioner frosting, i.e. relative humidity are higher, and air conditioner frosting is also easier, therefore, add the judgement bar of relative humidity
After part, its frosting degree can be further determined, it is to avoid the phenomenon frequently defrosted occurs in air conditioner.Furthermore, in outdoor unit disk
The average value of difference between pipe temperature and dew-point temperature is met on the basis of condition, then judges the duration of the state, can
More accurately to judge the frosting degree of outdoor unit, on the premise of avoiding frequently entering defrosting operation, it is ensured that defrosting operation
Dynamics and effect, improve Consumer's Experience.In addition, the present invention is when being defrosted, the mode of selection bypass defrosting, so,
During defrosting is bypassed, compressor is not shut down, and four-way valve is not also commutated, and air conditioner is heated incessantly, can be very big
Ground ensures the heating effect of air conditioner so that fluctuations in indoor temperature is smaller.
Brief description of the drawings
Fig. 1 is the structural representation of existing air conditioner；
Fig. 2 is the key step flow chart of the air conditioner defrosting control method of the present invention；
Fig. 3 is the structural representation of the air conditioner of one embodiment of the invention；
Fig. 4 is the specific steps flow chart of the air conditioner defrosting control method of the present invention.
Embodiment
The preferred embodiment of the present invention described with reference to the accompanying drawings.It will be apparent to a skilled person that this
A little embodiments are used only for explaining the technical principle of the present invention, it is not intended that limit the scope of the invention.Although for example,
In the application according to particular order describe the present invention method each step, but these be not sequentially it is restricted,
On the premise of without departing from the general principle of the present invention, those skilled in the art can perform the step in a different order
Suddenly.
Based on the opportunity problem for entering defrosting proposed in background technology, the present invention proposes a kind of defrosting control of air conditioner
Method processed, it is intended to make air conditioner enter defrosting mode on suitable defrosting opportunity, it is to avoid false defrosting, defrosting occur excessively etc. existing
As so as to be reduced as far as or even avoid because air-conditioning heating effect reduces phenomenon caused by defrosting.
Referring initially to Fig. 1, the figure is the structural representation of existing air conditioner.As shown in figure 1, air conditioner mainly includes outdoor
Machine 1, indoor set 2, compressor 3, four-way valve 4 and throttling arrangement 5.To those skilled in the art, the structure of air conditioner
Belong to and know technology, be not described in detail herein.
Referring next to Fig. 2, defrosting control method of the invention comprises the following steps：S110, is in air conditioner and heats work
In the case of condition, outdoor unit coil temperature is detected；S120, every the first preset time obtain an outdoor unit coil pipe temperature with
Difference between dew-point temperature；S130, calculates being averaged for the difference between the temperature and dew-point temperature of the outdoor unit coil pipe obtained
Value；S140, obtains the relative humidity of outdoor unit position；S150, based on the relative humidity of outdoor unit position, according to room
The average value of difference between the temperature and dew-point temperature of outer machine coil pipe, judges whether to make air conditioner enter defrosting mode.
On the explanation of relative humidity, relative humidity, represent absolute humidity in air with it is synthermal under saturation it is absolute
The ratio of humidity, total is a percentage.(namely refer to the steam-laden quality of institute and synthermal lower saturation in certain humid air
The steam-laden mass ratio of institute in air, this ratio is represented with percentage).Relative humidity is represented with RH.Relative humidity
Definition is that hydrometeor density (being represented with d1) and synthermal lower saturation hydrometeor density in unit volume air contained by reality (use d2 tables
Show) percentage, i.e. RH (%)=d1/d2x 100%；Another computational methods are：Actual air aqueous vapor pressure (uses p1 tables
Show) and synthermal lower saturation vapour pressure strong (being represented with p2) percentage, i.e. RH (%)=p1/p2x 100%.In the present embodiment
In, the relative humidity of outdoor unit position can be obtained by setting a humidity sensor on outdoor unit.
In above-mentioned steps S110-S150, when judging whether to make air-conditioning enter defrosting mode, outdoor unit institute is first determined whether
Relative humidity in position, the then value according to the relative humidity, further according between the temperature and dew-point temperature of outdoor unit coil pipe
Difference average value, judge whether to make air conditioner enter defrosting mode.Wherein, to refer to air gentle in moisture content for dew-point temperature
Under the conditions of pressure is all immovable, temperature during saturation is cooled to.Therefore, when the temperature of outdoor unit coil pipe is less than the dew-point temperature
When, frosting will be easy on outdoor unit.In order to determine whether the frosting degree of outdoor unit, it is to avoid frequently removing occurs in air conditioner
The phenomenon of frost, more accurately to judge the opportunity into defrosting, the present invention is added after the Rule of judgment of relative humidity, further according to
The average value of difference between the temperature and dew-point temperature of outdoor unit coil pipe, judges whether to make air conditioner enter defrosting mode.Tool
For body, the size of temperature and dew-point temperature according only to outdoor unit coil pipe judges the opportunity into defrosting, exists and frequently removes
The phenomenon of frost.For example, during winter, due to climate reasons, a burst of cold wind, which is blown over, to be also likely to cause the prominent of outdoor unit coil temperature
So reduction, and there is the situation of moment frosting；Air conditioner appears in certain due to itself or extraneous change in the process of running
The temperature of the outdoor unit coil pipe at one moment is less than dew-point temperature, and and then recovers normal (the i.e. decay at this moment once more
The change of speed belongs to anomalous variation), then now air conditioner is entered defrosting mode according to the judgement at this moment, it is clear that no
It is suitable opportunity, if there is multiple this situation, then can causes frequently defrosting.The decision condition of the present invention can be well
Avoid this case.
It should be noted that the numerical value of dew-point temperature is relevant with air pressure and water vapour content, the value of dew-point temperature can profit
Calculated with the computational methods of existing dew-point temperature, dew-point temperature can also be measured using pertinent instruments (such as dew point hygrometer).
Then the dew-point temperature is set in the program of air conditioner.Or the dew point temperature of environment where being obtained by air conditioner in itself
After degree, the dew point temperature value in program is automatically updated.
Above-mentioned steps S110-S150 is described in further detail below.
In step s 110, outdoor unit coil pipe temperature can be detected in real time by being disposed in the outdoor the temperature sensor of machine coil pipe
Degree, can also obtain outdoor unit coil temperature, these are without departure from protection scope of the present invention by other known means.
In the step s 120, it is preferable that the first preset time can be the arbitrary value in the range of 10-20 seconds.For example, can be with
First preset time is set to 10 seconds, 15 seconds, 20 seconds etc., those skilled in the art can select suitable according to practical application scene
The first suitable preset time.In a preferred embodiment of the invention, the first preset time is 15 seconds, i.e., obtained once every 15 seconds
The temperature of outdoor unit coil pipe, the outdoor unit coil temperature and the difference of dew-point temperature then obtained.Outdoor unit coil temperature and dew
The difference of point temperature can be represented with equation below：Δ T=Tes-Ti, wherein, Δ T is outdoor unit coil temperature and dew-point temperature
Difference, Tes is dew-point temperature, TiFor outdoor unit coil temperature.
In step s 130, it is each based on the outdoor unit coil temperature obtained in step S120 and the difference of dew-point temperature
Minute calculates the average value of the difference of an outdoor unit coil temperature and dew-point temperature.It is i.e. per minute interior to obtain four outdoors
The difference of machine coil temperature and dew-point temperature, is expressed as Δ T1、ΔT2、ΔT3、ΔT4, its average value M=(Δ T1+ΔT2+
ΔT3+ΔT4)/4.It should be noted that although the present embodiment is the temperature and dew point of the outdoor unit coil pipe of calculating in each minute
The average value of difference between temperature, but those skilled in the art can also be according to actual use scene settings in other times
Interior (such as 30s, 90s) calculates the average value of the difference between the temperature and dew-point temperature of outdoor unit coil pipe.These all without departing from
Protection scope of the present invention.
In step S140, the relatively wet of outdoor unit position is obtained by setting humidity sensor on outdoor unit
Angle value.Relative humidity is represented with HR.In the present embodiment, humidity sensor is arranged at outdoor unit air outlet, obtains outdoor
Relative humidity at machine air outlet, and using the relative humidity at the outdoor unit air outlet as judge one of defrosting opportunity according to
According to.
In step S150, based on the relative humidity at outdoor unit air outlet, according to the temperature and dew point of outdoor unit coil pipe
The average value of difference between temperature, judges whether to make air conditioner enter defrosting mode.For example, in HR ＞ 70% situation
Under, first determine whether whether the average value of the difference between the temperature and dew-point temperature of outdoor unit coil pipe is more than the first given threshold.
Preferably, the first given threshold is 0 degree Celsius.So, under the situation (HR ＞ 70%), as M=(Δ T1+ΔT2+ΔT3+Δ
T4When)/4 are not more than 0, it is judged as that air-conditioning is not necessary to enter defrosting, air conditioner is maintained current working, defrosting is not entered
Pattern.As M=(Δ T1+ΔT2+ΔT3+ΔT4When)/4 are more than 0, then judge whether the duration of the state is pre- more than second
If the time.In the present embodiment, the second preset time is the arbitrary value in interval 1-2 minutes.It is using the second preset time as 0 minute
Example, when average value M ＞ 0 state duration reaches 1 minute, is judged as that the frosting degree of outdoor unit has met defrosting opportunity
Requirement, now air conditioner is entered defrosting mode.Otherwise, i.e. the state duration of average value M ＞ 0 is not up to 1 minute, is sentenced
Break and be not necessary to enter defrosting for air conditioner, air conditioner is maintained current working, do not enter defrosting mode.Art technology
Personnel are it is easily understood that under frosting condition, increasing over time frosting degree also can gradually increase, by setting " persistently
The length of time ", can accurately judge the frosting degree of outdoor unit, so as to more accurately select defrosting opportunity.
In the case of HR≤70%, being averaged for the difference between the temperature and dew-point temperature of outdoor unit coil pipe is first determined whether
Whether value is more than the second given threshold.Preferably, the second given threshold is 2 degrees Celsius.So, under the situation (HR≤70%),
When M=(Δ T1+ Δ T2+ Δ T3+ Δ T4)/4 is not more than 1, it is judged as that air-conditioning is not necessary to enter defrosting, now makes air conditioner
Current working is maintained, does not enter defrosting mode.When M=(Δ T1+ Δ T2+ Δ T3+ Δ T4)/4 is more than 1, then judge the state
Duration whether be more than the 3rd preset time.In the present embodiment, the 3rd preset time is any in interval 2-3 minutes
Value.So that the second preset time is 2 minutes as an example, when average value M ＞ 1 state duration reaches 2 minutes, it is judged as outdoor unit
Frosting degree met the requirement on defrosting opportunity, now air conditioner is entered defrosting mode.Otherwise, i.e. average value M ＞ 1
State duration is not up to 2 minutes, is judged as that air conditioner is not necessary to enter defrosting, air conditioner is maintained current work
Condition, does not enter defrosting mode.It will be readily appreciated by those skilled in the art that under frosting condition, increasing over time frosting
Amount also can gradually increase, and by setting the length of " duration ", the frosting degree of outdoor unit can accurately be judged, so that more accurate
Really select defrosting opportunity.
It should be noted that, although the first given threshold in above-mentioned is 0, the second given threshold is 1, but this area skill
Art personnel can set other suitable threshold values according to practical application scene, and such as the first given threshold is set to 0.5 degree Celsius, the
Two given thresholds are set as 1.5 degrees Celsius etc..Setting (during HR ＞ 70%) and the second given threshold due to the first given threshold
Setting (HR≤70% when) be in accordance with relative humidity set, when relative humidity is larger, frosting is also relatively easy, therefore,
The first given threshold is less than the second given threshold under normal circumstances, and the mesh for entering defrosting opportunity is more accurately judged so as to realize
's.In addition, the value of relative humidity above can also be set according to the specifically used scene of air conditioner.
In summary, the present invention is based on by detecting the relative humidity at outdoor unit coil temperature and outdoor unit air outlet
The relative humidity, according to the average value of the difference between the temperature and dew-point temperature of outdoor unit coil pipe, judges whether to make air conditioner
Into defrosting mode.The present embodiment, in the case of relative humidity is determined, is judged into defrosting by two conditions come accurate
The average value of difference between the temperature and dew-point temperature on opportunity, i.e. outdoor unit coil pipe is more than the first given threshold/second and set
Threshold value, the state duration reaches the preset time of the second preset time/the 3rd., not only can be with by the two conditions
Judge that frosting has occurred in outdoor unit, can also further judge the degree of frosting, so that the opportunity for entering defrosting is more accurate
Really.In addition it is also necessary to explanation, above the first preset time, the second preset time, the 3rd preset time, the first setting
Threshold value, the second given threshold can be set according to actual application scenarios, can also be set by User Defined.
In addition, the step of control method of the present invention also comprises determining whether to exit defrosting mode, the step is specifically included
Substep：Step one：After air conditioner enters defrosting mode, compare outdoor unit coil temperature and the 3rd given threshold；
Step 2, according to comparative result, judges whether to exit defrosting mode.The purpose of above-mentioned steps one and step 2 is that determination is exited
The opportunity of defrosting.During defrosting, all the heating effect of air-conditioning can be more or less reduced, so as to influence indoor environment
Comfortableness.Therefore, select suitable opportunity to exit defrosting mode, can as far as possible shorten and remove on the premise of defrosting effect is ensured
The white time, so as to reduce the influence to air-conditioning heating effect.
Specifically, the 3rd given threshold can be the arbitrary value in 6-10 degree Celsius ranges.In the preferred reality of the present invention
Apply in example, the 3rd given threshold is 8 degrees Celsius.In defrost mode, when detecting 8 degrees Celsius of outdoor unit coil temperature Ti ＞
When, then judge whether the duration of outdoor unit coil temperature Ti ＞ 8 state reaches the second preset time.Second preset time
Can be the arbitrary value in the range of 30-60 seconds.In a preferred embodiment of the invention, the second preset time is 40 seconds, then, when
When outdoor unit coil temperature Ti ＞ 8 state continues more than 40 seconds, then judge that defrosting has been completed, defrosting is exited in now selection.
When outdoor unit coil temperature Ti is not more than 8, or outdoor unit coil temperature Ti is more than 8 but the duration was not less than 40 seconds,
It is judged as not completing defrosting, now continues defrosting mode.
It should be noted that in the above-described embodiments, being taken the photograph although exiting the condition of defrosting for outdoor unit coil temperature more than 8
Family name's degree and continue 40 seconds, those skilled in the art can also will move out the condition setting of defrosting to be above-mentioned according to practical application scene
In the range of other threshold values, as long as can accurately judge to exit the opportunity of defrosting.
As described above, in defrost mode, being carried out by the outdoor unit coil temperature that will be detected and the 3rd given threshold
Compare, to judge whether to exit defrosting mode.Because Temperature Difference Ratio of the outdoor unit coil pipe before and after frosting is larger, therefore, according to room
The temperature change of outer machine coil pipe can more accurately judge whether defrosting completes, so that on the premise of defrosting effect is ensured,
Shorten defrosting time as far as possible, reduce the influence to air-conditioning heating effect.In addition it is also necessary to which explanation, second above is pre-
If time, the 3rd given threshold can be set according to practical application scene, it can also be set by User Defined.
In one preferred embodiment, air conditioner has bypass branch, and defrosting mode is by turning on bypass branch
The bypass defrosting mode that is defrosted to outdoor unit coil pipe of mode.Specifically, reference picture 3, Fig. 3 is the implementation of the present invention
The structural representation of the air conditioner of example.As shown in figure 3, in this embodiment, air conditioner mainly include outdoor unit 1, indoor set 2,
Compressor 3, four-way valve 4 and throttling arrangement 5 (being electric expansion valve in the present embodiment) and connection compressor 3 and outdoor unit 1
Bypass branch 6, be provided with unidirectional by-passing valve, such as magnetic valve 61 on bypass branch 6.If reaching defrosting condition, into side
Logical defrosting mode.Defrosting condition is exited if reached, bypass defrosting mode is exited.Below on the basis of Fig. 3, with reference to Fig. 4
The concrete operation step of the present invention is described in detail.
Fig. 4 shows the detail flow chart schematic diagram of a preferred embodiment of the defrosting control method of the present invention.Such as Fig. 4
It is shown, heated in air conditioner operation under state, detected an outdoor unit coil temperature Ti every 15 seconds, and calculate outdoor unit coil pipe
Difference DELTA T=Tes-T between temperature and dew-point temperaturei, wherein, Tes is dew-point temperature, TiFor outdoor unit coil temperature.Then
Calculate average value M=(the Δ T for the difference for calculating outdoor unit coil temperature and dew-point temperature1+ΔT2+ΔT3+ΔT4)/4.Obtain room
The relative humidity HR of outer machine air outlet, and judge whether HR is more than 70%.In the case of HR is more than 70%, judge whether M is full
Sufficient condition：0 degree Celsius of M ＞, and the duration of the state (M ＞ 0) reach 1 minute.If meeting condition, removed into bypass
Frost；If being unsatisfactory for condition, do not enter defrosting mode.In the case of HR is not more than 70%, judge whether M meets condition：M
1 degree Celsius of ＞, and the duration of the state (M ＞ 1) reach 2 minutes.If meeting condition, enter bypass defrosting；If
Condition is unsatisfactory for, then does not enter defrosting mode.Calculating on M values, it should be pointed out that although above-described is by four
Individual temperature damping's value calculates M, but what this was merely exemplary, those skilled in the art can be according to practical application scene
The number and the acquisition time interval of each temperature damping's value for needing to adjust temperature damping's value, for example, can obtain every 10 seconds
6 Δ T are taken, 5 Δ T, etc. can also be obtained every 20 seconds.This adjustment is without departing from the principle and scope of the present invention.
Specifically, when M meets the condition for entering defrosting, air conditioner, which is sent, opens control instruction to magnetic valve 61, electricity
Magnet valve 61 is opened, and the HTHP cold media gas part that compressor 3 is discharged gets in machine 2 through four-way valve 4 and continues to heat, separately
A part is directly entered outdoor unit 1 through bypass branch 6.The cold media gas of HTHP can improve outdoor unit 1 in the shorter time
Organism temperature, make frost melts.So, during bypass defrosting, compressor 3 is not shut down, and four-way valve 4 is not also changed
To air conditioner is heated incessantly, can greatly ensure the heating effect of air conditioner so that fluctuations in indoor temperature is smaller.
When N is unsatisfactory for condition, then do not enter defrosting mode, until M meets and defrosting mode is entered back into after condition.
With continued reference to Fig. 4, during defrosting, the temperature Ti of outdoor unit coil pipe, and real-time judge outdoor unit are persistently detected
Whether coil temperature Ti is more than 8 degrees Celsius, and if maintain more than 8 degrees Celsius to reach 40 seconds, then judge that defrosting is completed, can
To select to exit defrosting.If it is not, then persistently being defrosted.When exiting defrosting, air conditioner sends closing control instruction and arrives electromagnetism
Valve 61, magnetic valve 61 is closed, and the HTHP cold media gas that compressor 3 is discharged all gets in machine 2 through four-way valve 4 and heated.
It should be noted that in order to shorten defrosting time, defrosting efficiency is lifted, can be by room when carrying out bypass defrosting
Exogenous wind office closes, and the heat of the cold media gas of HTHP is mostly used in defrost.When exiting defrosting operation, then by outdoor
Blower fan is opened.
Although above-described embodiment is illustrated exemplified by bypassing defrosting, but the defrosting control method of the present invention is not limited
In specific Defrost mode, those skilled in the art can select suitable Defrost mode according to the concrete structure of air conditioner, such as
Defrosting is replaced with bypass using reverse cycle defrosting, inverse circulation and the mode such as is combined.The present invention is intended to provide one kind can be more accurate
Ground judges the method for entering and exiting defrosting opportunity.
So far, combined preferred embodiment shown in the drawings describes technical scheme, still, this area
Technical staff is it is easily understood that protection scope of the present invention is expressly not limited to these embodiments.Without departing from this
On the premise of the principle of invention, those skilled in the art can make equivalent change or replacement to correlation technique feature, these
Technical scheme after changing or replacing it is fallen within protection scope of the present invention.
Claims (10)
1. a kind of air conditioner defrosting control method, it is characterised in that the defrosting control method comprises the following steps：
In the case of air conditioner is in heating condition, outdoor unit coil temperature is detected；
The difference between an outdoor unit coil temperature and dew-point temperature is obtained every the first preset time；
Calculate the average value of the difference between the outdoor unit coil temperature obtained and dew-point temperature；
Obtain the relative humidity of outdoor unit position；
Based on the relative humidity of the outdoor unit position, according to the difference between the outdoor unit coil temperature and dew-point temperature
The average value of value, judges whether to make air conditioner enter defrosting mode.
2. air conditioner defrosting control method according to claim 1, it is characterised in that " institute is in place based on the outdoor unit
The relative humidity put, according to the average value of the difference between the outdoor unit coil temperature and dew-point temperature, judges whether to make sky
Adjust device enter defrosting mode " the step of specifically include：
Judge whether the relative humidity of the outdoor unit position is more than default humidity threshold,
In the case of the relative humidity of the outdoor unit position is more than the default humidity threshold, the outdoor unit is judged
Whether the average value of the difference between coil temperature and dew-point temperature is more than the first given threshold, and is according to judged result judgement
No entrance defrosting mode；
In the case of relative humidity in the outdoor unit position is not more than the default humidity threshold, the outdoor is judged
Whether the average value of the difference between machine coil temperature and dew-point temperature is more than the second given threshold, and judge according to judged result
Whether defrosting mode is entered.
3. air conditioner defrosting control method according to claim 2, it is characterised in that
In the case of the relative humidity of the outdoor unit position is more than the default humidity threshold：
If the average value of the difference between the outdoor unit coil temperature and dew-point temperature is more than the first given threshold, judging should
Whether the duration of state is more than the second preset time,
If the duration of the state is more than second preset time, the air conditioner is set to enter defrosting mode；If
The duration of the state is not more than second preset time, then does not enter defrosting mode.
4. air conditioner defrosting control method according to claim 3, it is characterised in that in the outdoor unit position
In the case of relative humidity is not more than the default humidity threshold：
If the average value of the difference between the temperature and dew-point temperature of the outdoor unit coil pipe is more than the second given threshold, judge
Whether the duration of the state is more than the 3rd preset time,
If the duration of the state is more than the 3rd preset time, the air conditioner is set to enter defrosting mode；If
The duration of the state is not more than the 3rd preset time, then does not enter defrosting mode.
5. air conditioner defrosting control method according to claim 4, it is characterised in that the default humidity threshold is
Arbitrary value in 60%-80%, first preset time is the arbitrary value in 10-15 seconds, and second preset time is 1-2
Arbitrary value in minute, the 3rd preset time is the arbitrary value in 2-3 minutes.
6. air conditioner defrosting control method according to claim 5, it is characterised in that the default humidity threshold is
70%, first preset time is 15 seconds；And/or
First given threshold is 0 degree Celsius, and second preset time is 1 minute；And/or
Second given threshold is 1 degree Celsius, and the 3rd preset time is 2 minutes.
7. air conditioner defrosting control method according to any one of claim 1 to 6, it is characterised in that the defrosting control
The step of method processed also comprises determining whether to exit defrosting mode, the step includes：
After the air conditioner enters defrosting mode, relatively more described outdoor unit coil temperature and the 3rd given threshold；
According to comparative result, judge whether to exit defrosting mode.
8. air conditioner defrosting control method according to claim 7, it is characterised in that " according to comparative result, judge whether
Exit defrosting mode " the step of further comprise：
The outdoor unit coil temperature be more than three given threshold in the case of, judge the state duration whether
More than the 4th preset time,
If the duration of the state is more than the 4th preset time, the air conditioner is set to exit defrosting mode；
If the duration of the state is not more than the 4th preset time, the air conditioner is set to maintain the defrosting work
Condition.
9. air conditioner defrosting control method according to claim 8, it is characterised in that the 3rd given threshold is 6-10
Arbitrary value in degree Celsius range；And/or the 4th preset time is the arbitrary value in the range of 30-60 seconds.
10. air conditioner defrosting control method according to any one of claim 1 to 6, it is characterised in that the defrosting mould
Formula is the bypass defrosting mode defrosted by way of turning on bypass branch to outdoor unit coil pipe；And/or " obtain room
The step of relative humidity of outer machine position ", specifically includes the relative humidity obtained at outdoor unit air outlet.
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| CN201710349196.9A CN107120798A (en) | 2017-05-17 | 2017-05-17 | Air conditioner defrosting control method |
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| CN201710349196.9A CN107120798A (en) | 2017-05-17 | 2017-05-17 | Air conditioner defrosting control method |
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| CN112050376A (en) * | 2019-06-07 | 2020-12-08 | 青岛海尔空调器有限总公司 | Control method and control device for defrosting of air conditioner and air conditioner |
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| CN114777288A (en) * | 2022-03-18 | 2022-07-22 | 青岛海尔空调器有限总公司 | Defrosting method and device for air conditioner external unit |
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